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  • Discuss performance: Boris has filed two bugs (bug 373693 (addref) and bug 373694 (release). Status?
  • dbaron on slow down he was encountering.
  • Performance in general.
  • Outcome of leaks tests?
  • jst on status of landing the CC timing code (bug 374239).
  • Discuss next steps.

Leak Numbers


Sees no documents or windows leaked.


I'm still seeing significant leaks. I generally do run with leak gauge, but I only quit the browser once a week and thats by crashing.


Igor landed a patch that regressed the leaks a bit. See bug 375808

We're still missing javascript edges and that might cause leaks of windows. Igor has been working on a patch that makes the GC code and traversal code share the same code (bug 375270). So we automatically find all the javascript edges.

  • bug 375063 (Leaking nsJSContexts and nsXBLDocGlobalObjects at shutdown): This is the bug that caused Igor to file bug 375270. Will probably want to fix bug 375270 instead of landing the fix for bug 375063.
  • bug 375075 (Stop leaking the cycle collector on shutdown)

These are a bunch of safety checks that need to be removed in order to improve the performance: bug 373693 (Cycle collector makes AddRef about 6x slower) and bug 373694 (Cycle collector makes Release about 11x slower), not done yet.

Status of Pending CC Code in Bugzilla

Next Steps

  • Graydon is working on ES4.
  • Peter will take care of all the ifdefs and will measure before and after timings.
  • Dbaron will continue to monitor performance.

Audio of This Meeting